104.21.43.133
104.21.43.133 is an IPv4 address operated by Cloudflare, Inc. (AS13335), geolocated to United States. It belongs to datacenter or hosting infrastructure. As of November 2, 2026, IPDebrief rates it Low Risk (30/100); no anonymizing service was detected.
IP 104.21.43.133 was identified as an endpoint belonging to Cloudflare, Inc. (ASN 13335) and operated as a Content Delivery Network. The address presented a low-risk profile with a score of 30, though a moderate severity recommendation was issued for rate-limiting actions. Network scans revealed open TCP ports 80, 443, 8080, and 8443, with a server banner identifying the service as Cloudflare. No specific threat indicators, known attack campaigns, or attacker classifications were associated with the address. Control plane data indicated one DNS blacklist listing among eight total lists. The local subnet (104.21.43.0/24) was classified as clean with zero abuse density and no threat siblings. Defensive measures suggested included rate limiting traffic at a maximum rate of five requests per minute.
This summary was generated by AI and may contain inaccuracies. Verify critical details independently.
🏢 Ownership & Registration
| Organization | Cloudflare, Inc. |
| ASN | AS13335 |
| Network Name | CLOUDFLARENET |
| CIDR Block | 104.16.0.0/12 |
| RIR | ARIN |
| Country | United States |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR Record | No PTR |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
🔐 DNS Hygiene
| Hygiene Score | 0% (None) |
| SPF | Not configured |
| DMARC | Not configured |
| FCrDNS | Not verified |
| DNSSEC | Not signed |
| CAA | Not configured |
☁️ Network Classification
| Infrastructure | Infrastructure / Datacenter |
| Service Purpose | Web Server |
| Network Tier | Hosting — Infrastructure provider without advanced routing |
🔌 Services & Open Ports
| Port | Service | Protocol | Banner |
|---|---|---|---|
| 80 | http | tcp | — |
| 443 | https | tcp | — |
| 8080 | http-alt | tcp | — |
| 8443 | https-alt | tcp | — |
| Closed Ports | 22, 25, 3389 (4 open / 7 scanned) | ||
| Server | Web server detected |
| HTTP Title | — |
🔐 TLS Certificate
| SANs | None |
| Valid From | — |
| Valid Until | — |
🛡️ Public Network Snapshot
| Origin ASN | AS13335 |
| Network Prefix | 104.21.32.0/19 |
| Route mapping | Found |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 35% | 2 | 2 |
| routing | 25% | 1 | 1 |
| services | 35% | 2 | 2 |
| ownership | 25% | 1 | 2 |
| reputation | 25% | 1 | 1 |
| geolocation | 35% | 2 | 2 |
| Overall | 30% | 9 | 10 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (50%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-10-17 03:41:37 UTC |
| Last Seen | 2026-11-02 15:39:43 UTC |
| Profile Built | 2026-11-02 16:09:08 UTC |
| Data Freshness | Live |
| Signal Types | 18 |
| Total Observations | 124 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 104.21.43.133
Who owns the IP address 104.21.43.133?
104.21.43.133 is registered to Cloudflare, Inc.. The address falls within the 104.16.0.0/12 network block. Registration is held at ARIN.
Where is 104.21.43.133 located?
Geolocation data places 104.21.43.133 in United States. IP geolocation is approximate and indicates the network's registered or routed location rather than a precise physical address.
Is 104.21.43.133 malicious or safe?
104.21.43.133 currently carries a low risk assessment, meaning no significant threat indicators have been observed. This assessment is generated from continuously collected signals and can change over time.
What ports are open on 104.21.43.133?
Responsive ports observed on 104.21.43.133 include 80, 443, 8080, 8443. Port visibility reflects the most recent scan and may change as the host's configuration or firewall rules change.
Is 104.21.43.133 a VPN, proxy, or data center address?
104.21.43.133 is classified as a content delivery network based on network ownership and behavioural analysis.